#include "graphwidget.h"
#include "edge.h"
#include "node.h"

#include <QDebug>
#include <QGraphicsScene>
#include <QWheelEvent>

#include <math.h>

GraphWidget::GraphWidget()
    :  timerId(0)
{
    scenegw = new GraphScene(this);
    scenegw->setItemIndexMethod(QGraphicsScene::NoIndex);
    scenegw->setSceneRect(-2000, -2000, 4000, 4000);
    setScene(scenegw);
	setCacheMode(CacheBackground);
    setViewportUpdateMode(BoundingRectViewportUpdate);
    setRenderHint(QPainter::Antialiasing);
    setTransformationAnchor(AnchorUnderMouse);
    setResizeAnchor(AnchorViewCenter);
	this->state=0;
	scale(qreal(1.4), qreal(1.4));
    setMinimumSize(380, 380);
   
}

void GraphWidget::itemMoved()
{
    /*if (!timerId)
        timerId = startTimer(1000 / 25);*/
}

void GraphWidget::keyPressEvent(QKeyEvent *event)
{
    switch (event->key()) {
    case Qt::Key_Up:
        centerNode->moveBy(0, -20);
        break;
    case Qt::Key_Down:
        centerNode->moveBy(0, 20);
        break;
    case Qt::Key_Left:
        centerNode->moveBy(-20, 0);
        break;
    case Qt::Key_Right:
        centerNode->moveBy(20, 0);
        break;
    case Qt::Key_Plus:
      //  scaleView(qreal(1.2));
        break;
    case Qt::Key_Minus:
       // scaleView(1 / qreal(1.2));
        break;
    case Qt::Key_Space:
    case Qt::Key_Enter:
        foreach (QGraphicsItem *item, scene()->items()) {
            if (qgraphicsitem_cast<Node *>(item))
                item->setPos(-150 + qrand() % 300, -150 + qrand() % 300);
        }
        break;
    default:
        QGraphicsView::keyPressEvent(event);
    }
}

void GraphWidget::timerEvent(QTimerEvent *event)
{
    Q_UNUSED(event);

    /*QList<Node *> nodes;
    foreach (QGraphicsItem *item, scene()->items()) {
        if (Node *node = qgraphicsitem_cast<Node *>(item))
            nodes << node;
    }

    foreach (Node *node, nodes)
        node->calculateForces();

    bool itemsMoved = false;
    foreach (Node *node, nodes) {
        if (node->advance())
            itemsMoved = true;
    }

    if (!itemsMoved) {
        killTimer(timerId);
        timerId = 0;
    }*/
}
void GraphWidget::wheelEvent(QWheelEvent *event)
{
    scaleView(pow((double)2, -event->delta() / 240.0));
}
void GraphWidget::scaleView(qreal scaleFactor)
{
    qreal factor = matrix().scale(scaleFactor, scaleFactor).mapRect(QRectF(0, 0, 1, 1)).width();
    if (factor < 0.07 || factor > 100)
        return;

    scale(scaleFactor, scaleFactor);
}

void GraphWidget::drawBackground(QPainter *painter, const QRectF &rect)
{
    Q_UNUSED(rect);

    // Shadow
    QRectF sceneRect = this->sceneRect();
    QRectF rightShadow(sceneRect.right(), sceneRect.top() + 5, 5, sceneRect.height());
    QRectF bottomShadow(sceneRect.left() + 5, sceneRect.bottom(), sceneRect.width(), 5);
    if (rightShadow.intersects(rect) || rightShadow.contains(rect))
	painter->fillRect(rightShadow, Qt::darkGray);
    if (bottomShadow.intersects(rect) || bottomShadow.contains(rect))
	painter->fillRect(bottomShadow, Qt::darkGray);

    // Fill
    QLinearGradient gradient(sceneRect.topLeft(), sceneRect.bottomRight());
    gradient.setColorAt(0, Qt::white);
    gradient.setColorAt(1, Qt::white);
    painter->fillRect(rect.intersect(sceneRect), gradient);
    painter->setBrush(Qt::NoBrush);
    painter->drawRect(sceneRect);
}
void GraphWidget::setState(int newState)
{
	state=newState;
	Graph::state=state;
}
